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Total function using data from set

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    Total function using data from set

    I am attempting to learn how the total function works by examining AlphaSports database. I am looking at the invoice set. First, how do you open a set in the code editor? I have entered;
    tbl = table.open("invoice.set") The error message specifies the program could not find the set.

    The second part of my question deals specifically with the total function. In the code editor I entered the following code:
    ?total(invoice_items,GRP->invoice_header,GRP->invoice->items) Error: field is not recognized.

    To work around the problem associated with opening a set I created a new form which opened the set and then attempted to run the function as a script attached to a button on the form. I get a similar error.

    Doug McLean

    #2
    RE: Total function using data from set

    Douglas,

    Check the docs. I don't think the TABLE() function was intended to be used on a form. Isn't it for reports?

    If you're trying to display on a form the current sum of a single field in all linked child table records, I think you'll find this has been discussed a number of times before. If memory serves there are two approaches:

    1) a dbsum() or tablesum() function is used in a calculated field to compute the total and display it on the form; or

    2) a field is dedicated to this in the primary table and each line item field value is posted there as they are entered.

    -- tom

    Comment


      #3
      RE: Total function using data from set

      Douglas,

      You get to the set editor by going to the control panel, choosing the tables / sets tab, and then right clicking on the desired set. Then choose Edit Set from the right click menu. -- tom

      Comment


        #4
        RE: Total function using data from set

        For a set, instead of table.open(), oddly enough you use

        set.open().

        For your total() function, setting aside the discussion about where it is to be used, you are mis-using the parameters. After issuing

        in the interactive window

        t = set.open("invoice")

        try

        ? total(invoice_items-"quantity,GRP-"invoice_header,GRP-"invoice_items)

        assuming you want to total the quantity field in the invoice_items table

        and don't forget to t.close() when you're done.

        PS, if you want a discourse on the proper places to use total(), average(), count(), etc. - well just check the documentation. It says just in reports, it means not in field rules and a few other odd places.
        There can be only one.

        Comment


          #5
          RE: Total function using data from set

          Thanks, for your help. My initial problem involved attempting to open the set using the table.open(). The Xbasic reference manual indicates this is possible but I couldn�t get it to work. Stan�s suggestions worked perfectly. It seems to me there is great deal more flexibility in working with tables then sets. From a practical point of view I am not sure creating separate tables for invoice header and invoice items is wise. Placing this information in one file would allow one to make use of the many functions available only to tables. I suspect as Tom has indicated much of what I may want to do can be accomplished with reports. I approach Alpha Five programming for an understanding on how to do the same in dbase III. I realize this is a mistake but I am reluctant to allow Alpha Five to do the work behind the scenes. I continually want to go into the code editor and trace window to see what is happening.

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